Fix link checker reporting

We often see sucessful log output from `tap-spot` followed by a non-zero error code so we’ve swapped it for `tap-mocha-reporter` like we did on GOV.UK Design System

I’ve also added the `--canonicalroot` flag to check more internal assets that would have previously been skipped as external

Note: We still have a broken share image

* alphagov/tech-docs-gem#194

package.json

@@ -6,13 +6,13 @@
     "postinstall": "npm run build:sassdoc",
     "build:sassdoc": "sassdoc --parse node_modules/govuk-frontend/dist/govuk/ > data/sassdoc.json",
     "lint": "standard",
-    "check-links": "hyperlink -ri deploy/public/index.html --skip 'property=\"og:url\"' | tap-spot"
+    "check-links": "hyperlink --canonicalroot https://frontend.design-system.service.gov.uk --internal --recursive deploy/public/index.html --skip 'property=\"og:image\"' | tap-mocha-reporter min"
   },
   "devDependencies": {
     "govuk-frontend": "github:alphagov/govuk-frontend#0f5c7975f",
     "hyperlink": "^5.0.4",
     "sassdoc": "^2.7.4",
     "standard": "^17.1.0",
-    "tap-spot": "^1.1.2"
+    "tap-mocha-reporter": "^5.0.3"
   }
 }